from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import render_template
from flask import request
from flask import session
from sqlalchemy.sql.functions import user

from info import db
from info.constants import CLICK_RANK_MAX_NEWS
from info.models import News, Category, User, Comment, CommentLike
from info.modules import news
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route('/comment_like', methods=["POST"])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    # RET是一个类
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1. 取到请求参数
    comment_id = request.json.get("comment_id")
    action = request.json.get("action")

    # 2. 判断参数
    if not all([comment_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 3. 获取到要被点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            # 更新点赞次数
            comment.like_count += 1
    else:
        # 取消点赞评论
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            # 更新点赞次数
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")

    return jsonify(errno=RET.OK, errmsg="OK")

@news_blu.route('/news_comment',methods=['POST'])
@user_login_data
def comment_news():
    """评论新闻或者回复某条新闻下指定的评论
    :return"""
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户未登录")

    # 1.获取请求参数
    news_id = request.json.get('news_id')
    comment_content = request.json.get('comment')
    parent_id = request.json.get('parent_id')

    # 2.判断参数
    if not all([news_id,comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 3.初始化一个评论模型，并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 为什么要自己去commit(),因为在return的时候要用到comment的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK,data=comment.to_dict())


@news_blu.route('/news_collect',methods=['POST'])
@user_login_data
def collect_news():
    """收藏新闻
    1.接受参数
    2.判断参数
    3.查询新闻，并判断新闻是否存在
    ４．收藏
    ：:return"""
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户未登录")

    # 1.接受参数
    action = request.json.get('action')
    news_id = request.json.get('news_id')
    # 2.判断参数
    if not all([news_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg='参数错误')
    if action not in ['collect', 'cancel_collect']:
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')


    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR,errmsg='参数错误')
    # 3.查询新闻，并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg='数据查询错误')

    if not news:
        return jsonify(errno=RET.NODATA,errmsg='未查询到数据')

    # 4.收藏及取消收藏

    if action == 'cancel_collect':
        # 取消收藏
        user.collection_news.remove(news)
    else:

        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    return jsonify(errno=RET.OK,errmsg='操作成功')




@news_blu.route("/<int:news_id>")
@user_login_data
def news_detail(news_id):
    """新闻详情

    ：param news_id
    :return"""
    # 取到用户ｉｄ
    user = g.user
    # 右侧新闻的排行逻辑
    news_list = []
    try:
        # new_list查出来的是模型的数据，不能直接放在字典中
        news_list = News.query.order_by(News.clicks.desc()).limit(CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 将模型对象转化为字典
    # 定义一个空的字典列表，里面装的是字典
    news_dict_li = []
    # 遍历对象列表，将对象的字典添加到字典列表中
    # news只遍历一次，news.to_basic_dict()通过类实例调用取出来的是一个字典
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    #　查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        abort(404)

    # 更新新闻点击的次数
    news.clicks +=1
    # 是否收藏
    is_collected = False

    # if 用户已经登录：
    # 判断用户是否收藏当前新闻,如果收藏：
    # is_collected = True
    # collection_news 后面不用加all,因为ｓｑｌａｌｃｈｅｍｙ会在使用的时候去自动加载
    if user:
        if news in user.collection_news:
            is_collected = True

    # 获取当前新闻的评论
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids = []
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里面都点赞了哪些评论
            # 1. 查询出当前新闻的所有评论 ([COMMENT]) 取到所有的评论id  [1, 2, 3, 4, 5]
            comment_ids = [comment.id for comment in comments]
            # 2. 再查询当前评论中哪些评论被当前用户所点赞 （[CommentLike]）查询comment_id 在第1步的评论id列表内的所有数据 & CommentList.user_id = g.user.id
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == g.user.id).all()
            # 3. 取到所有被点赞的评论id 第2步查询出来是一个 [CommentLike] --> [3, 5]
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]  # [3, 5]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict["is_like"] = False
        # 判断当前遍历到的评论是否被当前登录用户所点赞
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    # if 当前新闻有作者，并且 当前登录用户已关注过这个用户
    if news.user and user:
        # if user 是否关注过 news.user
        if news.user in user.followed:
            is_followed = True

    """user.collection_news在if xx in usr.collection_news和for xx in usr.collection_news这两种情况下
    不用加all,usr.collection_news也会自己去查出来结果并返回"""

    data = {
        'user': user.to_dict() if user else None,
        'news_dict_li':news_dict_li,
        'news':news.to_dict(),
        'is_collected': is_collected,
        'comments': comment_dict_li
    }


    return render_template("news/detail.html",data = data)